Bag sealing machine



July 18, 1939. w. R. KOHL BAG SEALING MACHINE Filed April 7', 19:57

8 Sheets-Sheet 1 Jul 18, 1939.; w R, K'OHL 2,166,761

BAG SEALING MACHINE Filed April 7, 1937 a Sheets-Shet 2 July 18, 1939.w, KQHL 2,166,761

' BAG SEALING MACHINE Filed April 7, 1937 8 Sheets-Sheet 4 July 18,1939. w. R. KOHL 2,155,761

BAG SIEALING MACHINE Filed April 7, 1937 8 Sheets-Sheet 5 July 18, 1939.

w. R. KOHL 2,166,761

BAG SEALING MACHINE Filed April 7, 1957 s' Sheets-Sheet 7/I/lV/IIIIIIIIIVIIIIIIII/l w. R. KOHL 2,166,761

BAG SEALING MACHINE Filed April 7, 1937 8 Sheets-Sheet 7 .7291;

L M W MQ Eiilii$$iithfl July 18, 1939. w, R, KOHL v 2,166,761

BAG SEALING MACHINE Filed April 7, 1937 8 Sheets-Sheet 8 I 5 w Mumwi l IPatented July 18,1939

PATENT OFFICE 8 G SEALINGMAOHINE William R. Kohl, Glen View,lll. vApplication April 7, 1937, Serial No. 135,383

1a Claims.

My invention is a machine for the sealing of bags A A primary object isthe hermetic sealing of bags by the use of heat and pressure simultane--ously applied.

A further object is the sealing of bags by the combined use of heat andpressure, in combination with a signalling means for indicating the"temperature of the compressing units adequate ato fuse the sealingadhesive.

Another object is the provision of a machine which mounts a continuousroll of label strip bearing a thermoplastic cement, and feeding sectionsof' the said label strip automatically and intermittently over an openend of a bag, and sealing the same upon the said open end of the bag bypressure and predetermined heat suiilcient to fuse the cementitiousmaterial between the label strip and an open. end of the bag.

Other, and minor objects will be apparent.

The attached drawings are an embodiment of the said invention in which:'

Fig. 1 is an elevation of the machine. i

Fig. 2 is a sectional detail of the base of Fig. 1, illustrating thefoot lever action.

Fig 3 is an enlarged detail of a portion elevation shownin Fig. 1.

Fig. 4 is a plan detail.

Fig. 5 is a rear view of the upper portion of Fig. 1 and is a reverse ofFig. 3.

Fig. 6 is an end view from the right side of the machine illustratingthe upper part of .the machine shown in' Fig. l.

Fig. 7 is a sectional view of a portion of the pillar shown in Fig. 1detailing the partsand movementsof said section. 1

Fig. 8'15. a detail of heating units and the tog-.- gle mechanism foroperating the heat units.

Fig. 9 illustrates the knife section associated with the heat units andoperated by the toggle mechanism as shown in Fig. 8.

Fig. 10 is a detail end view showing the mechanism illustrated in Fig.8.

Fig. 11 is a sectional view showing the'sealing of the I in the primarystage.

Fig. 12 is an illustration of the perfected bag sealer.

Fig. 13 shows the end of a bag exhibiting the indentations aftersealing.

Fig. 14 is a diagrammatic presentation-of the electrical heating unitsand automatic heat regulation.

Fig, 15 is a sectional detail of the parts engaged in feeding andfolding the sealing label.

P18. 16 is a sectional detail showing'the paper advancing mechanism, andthe mechanism for intermittently advancing the sealing strip or label..

the members shown in Fig. 16.'

Fig. 18 is an ehlargedsection of a portion of Fig. 5, showing thearrangements for driving the forming mechanism of the parts shown inFig. 15.

Fig. 19 is a detail of the ing assembly.

Fig. 20 is a cross section'of Fig. 7 along line 20---2l|. I

As illustrated,- I is the supporting frame for .the principal operativeparts of the mechanism. 2 is a portion of a column containing the.mechanism forre'gulating a clutch, and a trip-mechanism for regulatingtheclutch movement, which said clutch movement automatically advancesthe members controlling the delivery of the paper to be used in sealingbags. '3 isa column attaching the base t6 the upper operative portion ofthe device. l is the base support for the trip assembly. s is a pedalrotatively mounted at s 1 and having means I and 8 to operativelyconnect pedal 5, rod I, and yoke ll. 9 is a shaft on which a roll ll ofprepared sealing material is mounted. M is a brake journalled on l2, itsbearing on I011 tensioned' by a spring 15 on a rod l3, said tensioningrod journalled on ll; there being a knurled nut Ila for altering thetensionof the spring II. I is an idler-roller journalled on l1. l9 isaroll iournalied at 20 on l8, tensio'ned by a spring 2|. 22 is a rollerover which sealing'paper passes which said roll is journalled at 23. 22ais an adjustable wall forming a guide directing paper coming from rollI] just prior to its-being drawn in by 24 journalled on 25. 26 is amilled Fig. 17 shows'a clutch mechanism for operating 7 mechanism of thesealiac'e on with achannel 21 between the two I milled faces" and 26; 2|is a roller-with fric tional face 20 and fixed shaft ll. Shaft It iour-.nalled in yoke 32, swinging from 33 carries agear 3|. Tensione'd by aspring )2 gear meshes.

yet permits acertain clearance of movement between the face of 29 andthe face 26 of the member 24, providing for variations in the thicknessof the material passing therebetween. 3.4 is a form fixed on a shaft 35having warped surfaces flaadaptedto begin a process of'foldirig thestock as it comes from the combination, of

24 and 20. As the material passes over 34, it begins to take aninvertedv shape 34b, and inthat form is drawn into a recessed pulleyhaving a rim 13 V shapedin radial section on a shaft 39.

A. forming disc 38 fixed ,to a shaft 31 iswings somewhat freely on shaft3| tensioned by a spring "d provides for a certain variation ofclearance is adapted to operate freely in connection with for the vshaped circumference 4|. II is a disc the shaft in one direction only,and to automatwith a lug a adapted to set in arecess b in ically releasein the opposite direction so that shaft 3! to position the wheel II on.the shaft -when the foot pedalds pressed down the member 3.. A springll to press against the ii is thrust upward without action upon the.disc II has an adi fi ble nut c for tensioning clutch other than areleasing movement: but

the wheel 38 on shaft ll, providing fora certain when the foot lever isreleased the clutching takes amount of slippage. Gear 42 is positivelyfixed place driving shaft 2! andautomatically drawand is driven throughan idling gear ill by the "Rear wheel I". M is a collar on shaft 3.. I

is one member of a shears positioned by screws 41 on a sealing memberII, the other shearing ing the sealing material forward between 2 and 24preparatory to delivery at the point of final action. Clutch .4 isdemountably associated with a gear III by a stud III, which said geariisfixed member ll is fixed to a complementary sealing to the shaft II by atapering pin ill. III is a member I! by a bolt II, the blades I areadapted sear rotatably positioned on a shaft ill meshing to cut thepaper material flb as.it is advanced with an idling gear I, on a shaftIII. III is a to a proper position for severance. II are pardisc havinga circumferential shoulder on its allel slide rolls seated in channelsit and ioined outer edge positioned upon the shaft I by a by a yoke 54with nuts ll. The/said rods II wt'serew Ill, with a spring illcircumferentially said plate demountably fixed to a sealing withtriangular incisions around the are joined to a plate Ila by rivetted enlglzi, t The said assemblage II, II, N, and Ii are attached by aconnector l'lrotatably associated with a toggle assemblage composed of58, I9 and II; The member," has its bearing 82 and the member II hasits.bearing at it on a bell crank 64 rotatably mounted at ll. Fixedlyassociated with-the member II is an arm I and attached thereto is aspring "a, fixed at I, and adapted to return the toggling members, rod 1and draw memberjil to theirinitial position. O1 is] connecting elementrotatably pendant at II on bell crank 84 which said member 61 has anextension rod II with'a yoke'lito which is attached a rod- 1 formingpart of the assemblage with the'foot members a, s, 1, and s, iadaptedfor impelling the entire mechanism. I2 is a latch rotatably mounted on18 and having at a substantially central point a boss ll with latchingend ",said latch adapted to be raised by contact with the yoke II on itsreturn after being drawn down to set the machine in operation. A pin IImounted in the yoke ll moves in a slot Ila in a segmental gear ll, saidgear rotatably fixed on-a'trunnion l'l. The teeth ll on the segmentalgearglj are adapted .to mesh with the teeth on .a segmental gear II,which gear is fixed on shaft I, also having a gear II, which said gearll is adapted to mesh with a gear rack I2 upon a sliding member "a. Gearll has .a lever II which said lever "is adapted to. be raised to anupright position where it will come into contact with the latch J2"at Non a downward draft of the connecting rod I; at which time the'latch 12also comes into contact withstud l4, checking the progress of said latchwhich is automatically forced into connection with 0 by the spring 85.Simultaneously with the raising of the arm II to its latching by I2anarm extension ll of shaft ll throws upward an, arm lliournalied at llon an'adjustable member 88 setin position by I 'on IT, and simultaneouswith this combined P movement the member "a is raised compressing]the'spring 8 against a buttress liafcausing. a tension in said springand the partsoperating 1 therewith to be held in positive position bythelatch 08 in'--con.iunctioniwith thearm 83. On ll"-is a rack 02 extendingupward to a gear I on a clutch'member 04 which clutch member N isiournalled on one end of shaft". The cir-L cumferenoe ll ofthesaid'clutch being provided said. air-- I cumference in which eachincision the long plane I. has floating thereon a roller member I! whichisnormally held in tension by a spring ll inside of a frictional portion80: this clutch member around the surface of ill and Ill, held intensionaiipo'sition between a wall on Ill and thecircumferentialshoulder on I": this tensional arranseinent is adapted to act upon themm a .on which is assembled the creasing member 38,

providing for a certain compensation in the passage of the paper beingcreased by the member II in the V channel A! of the member II. II. isthe framing with a central bracing support ill in which is assembled apair of sealing members II and 12, the outer-sealing member ll is fixedv in the framing Ill and the member I! is mov- 1- able in the directionof the member II. The member -II has a demountabie face plate "I, andthe member "has a complementary demountable face plate ill at the pointwhere the two members II and I! come together. In the member ll there isassembled an electric heating unit Ill, immediately adjacent to the faceplate III, with an electric thermostat HI adapted to automaticallycontrol the temperatures, the said thermostat having its wire connectionIII in a Junction ,box I25. The'inember I! has immediately adjacent theface plate l I! a heat unit i ll, witha lead wire I, the said heatingunit being a duplicate of the heat unit H4, the said units heating theface plates Ill and ill similarly:

the lead wires 8 and lll receiving current in the junction box 'II'I,ounted upon the frame of ill. .The therm t lli'connects in theiunctionbox to a light I24; which signals when the temperature in theheating units is maintained at a predetermined point, the device beingdesignedto indicate temperatures below a predetermined point by cuttingin the light. and adapted to cut off the light when the tempera- Atureis above a certain point in the face plates v I I2 and ill.faceplates are demountable ,and adapted to such changes as may bedesired for the impressionabeing made upon the labels which are sealedbythe operation of the machine. 1 I

It will be understood and appreciated that the device is shown in the,drawings as operated by footpower, but the entire mechanism above thecolumn 3 is adapted ,to be operatd'by power application-wtherthan thebase 7 foot opera tion-simply by operating the'conh'ecting rod 1 bysuchapplied power. It is also who understood that whereas the drawings showa positioning of a single package-which maybe posican be applied aconveyor'system which will feed the bags automatically ,other than byindividual-operation of a foot lever. It will nbw tioned' by'handtheoperation of the invention beappreclated that the operation of the machineis as follows:

DIBSSUIG.

' a movable in a plane with the fixed member; means '55 for driving themovablennember into compression relation with the fixed member, meansfor de- 7 A roll-of such proportions asone may dematically fed to anopen end of a bag in form sire-of a strip'mateiial such as paper ismountr ed upon the machine for substantiallycontinuous feeding. Thisstrip is coated on one side of the material with a thermoplasticadhesive. When the rod l-whether impelled by foot or other power-4sdrawn downward, it primarily accomplishes two things, the drawing of thecompression members into action for compression while at the same timeit sets into operation a mechanism which provides for a movement toadvance a portion of the roll a definite. predetermined distance therebeing constraining means to limit that advancement. This main activityof advancement is accomplished by means of a clutch, which said clutchonly operates in one direction. When the compression and sealing isaccomplished, the return of the connecting rod I to its initial positionreleases the clutch, which is regulated by a spring and when the clutchis released it immediately advances a new portion of the stripto aposition over the bag to be sealed; simultaneously with the advancementof the strip to its operative position, the predetermined section issevered from the main strip. The compressing members are automaticallymaintained in temperature by an electric signal responsive to athermostat immediately adjacent to the compression jaws, the saidthermostat designed tooperate at a specifically given minimumtemperature, which is'essential to the liquefying of the thermoplasticadhesive. Simultaneously with the closing of the compression jaws, thethermoplastic adhesive is fused between the folds of the severedsections of the strip and the sides of the bag adjacent to the openingto be sealed,

I do not limit myself to any specific description of any of the partsonly in so far as I am limited by thescope of myclaims.

' I claim:

1. In a bag closing machine means for hermetically sealing the mouth ofthe bag comprising juxtaposed compression jaws co acting simultaneouslywith a predetermined temperature in the jaws of said compression meansadapted to cause a fusing of a dry thermoplastic adhesive. coincidentwith the compression means to seal any object interposed between saidjaws and the mouth of the bag by the combination of heat and 2. In a bagclosing machine, compressing means comprising} pair of adjacentlylocated members, one of which is fixed and the other livering betweensaid members a label strip folded over a bag mouth, means toautomatically regulate the temperature above a. predetermined minimumtemperature sufiicient to fiuidify an adhesive coating'upon one face ofthe label strip) 3. In a machine for hermetically sealing the open mouthof a' bag comprising a support for a label strip precoated with a drythermoplastic cementitious substance; means for automaticallypresentingto the open end of a bag a section .ofthe pre-coated strip inform to overlie an 4 open end of the bag, means to press the sealing.

members, automatic means'tq heat the compresperature sufiicient to causethe fluidifyingof the coatingbetween the. label and the bag.

N A machine for the purposes described,

15 whereby a pre-coated stripe! paper is autoto close said end of a bag,means for pressing the said strip upon the portion of the bag to beclosed thereby, means simultaneous with the application of closingpressure to automatically 5 end by said label strip under heat andpressure. 10

5. In a. machine of the character described, compression meanscomprising a pair of laws,

one of which is fixed and the other mechanically movable toward and inthe plane of the fixed jaw, each of said jaws having means to be heatedand maintain the heating thereof at predetermined minimumtemperaturea'means to intermittently placebetween said jaws over a bagmouth a label strip, means to bring the said jaws'intosuch closerelation as to compress the objects placed therebetween; means toautomatically maintains. minimum temperature in each of the saidcompressing jaws whereby the strip having upon one face thereof acoating of thermoplastic adhesive may be acted upon to suiilclentlyfiuidiiy said adhesive and effect a sealing ofthe objects placed betweensaid jaws.

6. In a device for the purposes described means for drawing into saidmachine material adapted of coated with a dry thermoplasticadhesivepmeans for intermittently feeding from thesaid roll the said materialinto means for shaping the said sealing material into the form of an tosealing of bags, materialhavingone side there 6 inverted V, means-forintermittently shear cut- 35 ting the said Y shaped material intopredetermined lengths, means for sealing the sheared portions'onto bagsor bag material by the combination simultaneously of pressure andpredewhich has been treated to a coating ofthermo plastic adh ve, meansadvance the said strip mtermitteht y, one,stage being the in-folding of'the said strip. meansto position the said strip.

over'th'eend of a to be, sealed between two members of a compressionmeans, one of the same adapted .to be advanced .to a point ofcompressing the strip intoa position-fiver the mouth and ,on either sideof 'the' bag, and means to simultaneously heat the unitsof compressiontomelt j ,the thermoplastic adhesive into the area between the insideportions oi the strip to the outer portions of the bagyehds beinrsealed.

'- 8. A machine of the type described, a mount- .0

ingfor. a substantially continuous roll of label plastic adhesivecoating has been applied, a means for automatically delivering into saidmachine a definite pie-determined portion of materia l to which saidlabel material a thermosaid mounted roll, m as for shaping the same inthe course of the terial'tliru the machine,

means to deliver definite portions of saidmaterial 'at a point wheresevered portions-are automatically placed upon-an open end of a bag, andsimultaneously applying to said label and the said bag predeterminedtemp'eratures sufficient to render the thermoplastic adhesive fluid,pressure means suiiicientjo perfect hermetical sealing of the said labelupon a pre-determined portion of the said bag.

9. In a machine of the class described, means for applying adhesive tapeover ends of bags to hermetically seal same, comprising a mounting fora'roll of tapepre-coated'on one side 'with a dry thermoplastic adhesive,means for advancing and guiding the tape intermittently to a point offorming the said tape into a substantially V- 'shaped form, the innersurfaces of'the formed tape being the 'sides containing the adhesive,meansat a point to deposit the tape over the end of the bag to besealed, means to automaticab' 1y heat the bag end and the tape to atemperature sufllcient to fuse the adhesive, means adapted to advance apressure closing the tape and the fused adhesive between the tape andthe sides of the bag. I

.10. A machine of the class described, com- 20 prising means torotatably mount a roll of strip label materialhaving one face of saidstrip coated with a thermoplastic composition; meansto advance the saidstrip intermittently predetermined distances, there being means to auto-25 matically control the advance oi the said strip; means to shape thesaid strip into a substantial V form during its advancement adapting itto be placed over an open end of a bag; means to.

automatically sever the said strip in its travel 30 into pre-determinedlengths and place each 'severed portion over 'an open portion of a bagpositioned between the compression members, compression meansautomatically heated to a pre-determined temperature to fuse the thermo-5 plastic composition between the strip label and mined portions of thesaid coated material and? means associated therewith to limitthe amount5 taken for each specific object to be sealed; means to shape thesaidmaterial in its passage adapting it to be placed upon a bag to besealed, means to separate from the body. of said material at predetermined moments'sections of such shaped ma- 50 ierial as may bepredetermined for the purpose of sealing, means to automatically placeupon anopen portionofabag container thesaid formed section of sealingmaterial, and means to simultaneously apply to said label and thesaidbag '55 container-closing pressure and heat of pre-determined minimumtemperature adapted to render the thermoplastic substance suiii'cientlyfluid to the type described having I cause the hermetical sealing ofthat portion of the bag to which the sealing material is applied.

12. In a device tor the purposes described means to deliver a creasedlabel having a thermoplastic coating 'ini'olded over the mouth portion 5of a bag, means to hermetically seal the bag by heat and pres'sure.

.13. In a machine of the character described means to center a labelhearingat thermoplastic adhesive coating over the mouth end of a bag,means to bring a pair of opposed heated jaws into contact with the labeland bag, and seal the same by heat and pressure.

14. In a machine of the class described means to place a partiallyfolded label having its inturned surface coated with a thermoplasticadh'esive over the mouth of a bag, means to seal said label in placeover and adjacent to the mouth of the bag by the application of heat andpressure.

15. In a machine for the purposes described means to center a label withrelation to a bag, means to move the centered label into a pre-determined position -with'relation to the bag,opposed heated jaws disposedon each side of the 2:; bag, means to operatemsaid jaws whereby thelabel is sealed to the bag by the application of heat and" pressurebetween said jaws.

16. In a device oi. the character described means to position alabelbearing an iniolded coating of thermoplastic adhesive over themouth of a bag, opposed heated jaws disposed on each side of the bagmouth, means tmforce said jaws into pressure action and seal the labelto the bag by the fusing of the thermoplastic adhesive and the pressureof the jaws. I

17. In a device for the purposes described means to deliver over themouth of a bag a predetermined portion of material V-shaped. itsinfolded sides bearing a coating of thermoplastic 40 adhesive adapted tocover the mouth of the bag and a portion of its adjacent sides, means toseal the said material to the bag by heat fusion and pressure. 7 J

18. In a device of the character described a 4 5 mounting to carry aroll of flexible material coated on one side "with a thermoplastic"adhesive, means to intermittently draw sections of said flexiblematerial and shape the same into a substantially v-shape with thethermoplastic ad- I hesive iniolded, means to intermittently severpredetermined portions of saidfl'iiexible material, means to delivereach severed portion over the mouth of the bag, means to seal theflexible-material to the bag with heat and pressure.

wnmsm a. KOHL.

